00366nam a2200109Ia 4500008004100000082002300041100001800064245004900082260005000131300002100181490005400202260223b        |||||||| |||| 00| 0 eng d  a338.10913bUp71.ET  aUpton, Martin  aThe economics of tropical farming systemsb/  aCambridge:bCambridge University Press,c1996  axiv, 374p. Index  aWYE studies in agricultural and rural development